Table II.

Weighted association between socio-demographic variables at baseline and use of e-cigarettes at follow-up (México, 2012–2015)

	E-cigarettes used in the last six months (N=752)			E-cigarettes used in the last month (N=752)
Baseline Variables	%	OR CI 95%	AOR CI 95%	%	OR CI 95%	AOR CI 95%
Sex
Female	4.6	1.2 (0.44, 3.32)	1.1 (0.35, 3.70)	2.0	1.2 (0.33, 4.52)	1.4 (0.47, 4.66)
Male	3.9	1.00	1.00	1.2	1.00	1.00
Age
18–29	6.9	2.0 (0.29, 14.84)	2.0 (0.28, 15.38)	5.8	12.7 (1.41, 114.47)	10.2 (1.14, 92.44)
30–39	5.2	2.5 (0.34, 18.61)	2.1 (0.30, 15.84)	0.8	1.8 (0.15, 22.42)	1.4 (0.10, 23.05)
40–54	4.6	1.4 (0.18, 10.86)	0.9 (0.12, 7.53)	1.7	5.0 (0.52, 50.01)	4.6 (0.46, 47.38)
55 and more	1.2	1.00	1.00	0.6	1.00	1.00
Education
Middle school or less	2.4	1.00	1.00	1.4	1.00	1.00
High school or more	7.7	3.4 (1.19, 10.08)	1.6 (0.52, 5.20)	1.9	0.8 (0.23, 2.80)	0.3 (0.06, 1.71)
Income
Low	1.6	1.00	1.00	1.1	1.00	1.00
Middle	6.0	6.6 (1.54, 28.85)	6.2(1.22, 31.65)	2.4	5.0 (1.09, 23.47)	5.6 (1.00, 31.40)
High	8.1	8.9 (2.11, 38.00)	7.0 (1.52, 32.73)	0.9	1.6 (0.18, 15.19)	1.9 (0.20, 19.11)
Unknown	7.2	6.6 (1.50, 29.80)	7.2 (1.63, 31.75)	3.1	6.7 (1.38, 32.98)	6.3 (1.06, 37.85)
Smoking status
Daily	4.2	1.00	1.00	1.7	1.00	1.00
Non-daily	6.2	1.2 (0.39, 3.83)	1.3 (0.40, 4.39)	2.2	0.7 (0.20, 2.92)	0.7 (0.18, 3.26)
Quitters	2.4	0.8 (0.17, 4.54)	1.3 (0.26, 6.75)	0.6	0.2 (0.02, 1.73)	1.3 (0.25, 7.00)
E-cigarette trial
No	3.3	1.00	1.00	1.1	1.00	1.00
Yes	20.5	7.2 (2.36,22.51)	7.2 (2.26, 23.04)	9.1	10.4 (2.66, 40.83)	15.9 (2.93, 86.80)